<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>[HMTL&CSS]爱心动画</title>
    <style>
        *{
            margin: 0;
            padding:0;
        }
        body{
            display: flex;
            align-items: center;
            justify-content: center;
            height: 100vh;
            background-color: #2c3e50;
        }
        ul{
            display: flex;
            height: 200px;
        }
        ul::after{
            content:"爱心动画";
            position: absolute;
            top:0;
            left: 50%;
            color: #fff;
            transform: translate(-50%, 100%);
            font-size: 30px;
            font-weight: 700;
        }
        li{
            list-style: none;
            width: 20px;
            height: 20px;
            float: left;
            margin: 0 10px;
            border-radius: 10px;
        }
        li:nth-child(1){
            background-color: #f1c40f;
            animation: love1 5s 0s infinite;
        }
        li:nth-child(2){
            background-color: #e67e22;
            animation: love2 5s .2s infinite
        }
        li:nth-child(3){
            background-color: #3498db;
            animation: love3 5s .4s infinite
        }
        li:nth-child(4){
            background-color: #e74c3c;
            animation: love4 5s .6s infinite
        }
        li:nth-child(5){
            background-color: #16a085;
            animation: love5 5s .8s infinite
        }
        li:nth-child(6){
            background-color: #e74c3c;
            animation: love4 5s 1s infinite
        }
        li:nth-child(7){
            background-color: #3498db;
            animation: love3 5s 1.2s infinite
        }
        li:nth-child(8){
            background-color: #e67e22;
            animation: love2 5s 1.4s infinite
        }
        li:nth-child(9){
            background-color: #f1c40f;
            animation: love1 5s 1.6s infinite
        }


        @keyframes love1 {
            30%, 50%{
                height: 60px;
                transform: translateY(-30px);
            }
            70%, 100%{
                height: 20px;
                transform: translateY(0);
            }
        }
        @keyframes love2 {
            30%, 50%{
                height: 125px;
                transform: translateY(-60px);
            }
            70%, 100%{
                height: 20px;
                transform: translateY(0);
            }
        }
        @keyframes love3 {
            30%, 50%{
                height: 160px;
                transform: translateY(-75px);
            }
            70%, 100%{
                height: 20px;
                transform: translateY(0);
            }
        }
        @keyframes love4 {
            30%, 50%{
                height: 180px;
                transform: translateY(-60px);
            }
            70%, 100%{
                height: 20px;
                transform: translateY(0);
            }
        }
        @keyframes love5 {
            30%, 50%{
                height: 200px;
                transform: translateY(-45px);
            }
            70%, 100%{
                height: 20px;
                transform: translateY(0);
            }
        }


    </style>
</head>
<body>
    <div>
        <ul>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </ul>
    </div>
</body>
</html>